doc: fix warning treated as an error
Typical error: ``` Warning, treated as error: /home/jenkins-build/build/workspace/ceph-ansible-docs-pull-requests/docs/source/day-2/upgrade.rst:2:Title underline too short. ``` Signed-off-by:Guillaume Abrioux <gabrioux@redhat.com> (cherry picked from commit 5c254861)
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